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Application filed by И. Филиппов В., Н. И. Аленин, М. К. ПаршинаfiledCriticalИ. Филиппов В.
Priority to SU1448391ApriorityCriticalpatent/SU336701A1/ru
Application grantedgrantedCritical
Publication of SU336701A1publicationCriticalpatent/SU336701A1/ru